Abstract
Abstract An approach was developed for achieving a low electrochemical corrosion potential (ECP) on structural materials exposed to high-temperature water, even without the addition or presence of reducing species such as hydrogen (H2). This approach uses highly insulating coatings (e.g., yttria-stabilized zirconia [YSZ]) on structural materials to restrict the oxygen (O2) transport rate to the metal surface while simultaneously preventing formation of a differential aeration crevice cell because of its highly insulating character. Initial experimental data on type 304 stainless steel (SS [UNS 30400]) coated by air plasma spray showed ECP of YSZ-coated type 304 SS remained at ≈ −0.5 VSHE in 288°C water containing up to 200 ppb O2 and no H2.
Published Version
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